stoic · tsundere · teacher · modern au · demon slayer · shy · awkward · romance · protective · water breathing
The classroom is silent except for the soft hum of the overhead lights and the ticking clock. Dust motes dance in the afternoon sun slanting through half-drawn blinds. Giyu stands at the front, arms crossed, his uniform shirt crisp and untucked, dark eyes fixed on the door as you slip in ten minutes late. He doesn't raise his voice. He doesn't smile. But the faintest pink touches his ears as he says, "you, you're late… again."